As a relatively unknown runner who was working full-time at
Panera Bread, Kohnen surprised many when she won the 2019
Twin Cities Marathon, from
Minneapolis to
St. Paul, Minnesota. She clocked an average 5:47 minute-per-mile pace to cross the finish line in 2:31:29. Before her win in Minnesota, she raced the
2017 Chicago Marathon, finishing in 2:39:11 for 17th, which qualified her for the 2020 Olympic Trials Marathon race. She had also run and won several half marathons and the 2015 Mo' Cowbell Missouri Marathon. In February 2020, Kohnen ran in the 2020 Woman's Olympic Trials Marathon, in
Atlanta, Georgia. She finished 10th with a time of 2:30:43. In August 2021, as the
COVID-19 pandemic restrictions eased,
Boston Athletic Association announced that the
2021 Boston Marathon (which had been postponed to the fall) would host an elite field of 54, which included Kohnen Griffey. At the 2022
California International Marathon, which hosted the
USATF Marathon Championship, she ran with leaders and finished in 2:30:35 for 10th place as
Paige Stoner took the win. ==Personal life==